import React, {Component} from 'react';
import './index.css'
class Footrt extends Component {
    handleCheckAll=(event)=>{
        this.props.checkAllTodo(event.target.checked)
    }

    handleClearAllDone = ()=> {
        this.props.handleClearAllDone()
    }
    render() {
        const {todos} = this.props
        //已完成的个数
        const doneCount = todos.reduce((sum,todo)=> {
            return  sum+(todo.done?1:0)
        },0)
        //总数
        const total = todos.length
        return (
            <div className="todo-footer">
                <label>
                    <input type="checkbox" onChange={this.handleCheckAll} checked={doneCount===total && total!==0 ? true : false}/>
                </label>
                <span>
                            <span>已完成{doneCount}</span> / 全部{total}
                        </span>
                <button className="btn btn-danger" onClick={this.handleClearAllDone}>清除已完成任务</button>
            </div>
        );
    }
}

export default Footrt;